Hugsvape Piper RDA is a 24mm diameter RDA which perfectly matched with the Hugsvape Surge Squonk Mod. Constructed by stainless steel, it is also a dual vertical coil RDA with both 510 pin and squonk pin, its bottom airflow transfers to side airflow through the tube and then hits the coils directly from inside. Both 510 pin and Squonk pin are available. 5 colors are available.